World backup fixed by jbondhus

Empty folders are no longer created each day. See issue 64 for more
info.
Merge pull request #65 from edvind/master

Support for APT repository installed Minecraft-Overviewer
Added conditional folder erasing feature - only cleans up backups folder if $BACKUPSCRIPTCOMPATIBLE is set to yes in the config file.
Made some minor improvements

Added some comments and informational commands, removed the old
informational commands and removed the old system of removing old
backups.
Fixed bug where the backup folder doesn't exist after rolling backups. Now the script makes the backup folder if it doesn't exist.
Merge pull request #67 from jbondhus/master

Backups Script Compatibility Improvements and Bug Fixes
render maps with lower priority
Merge pull request #70 from mdornseif/master

Render with lower priority
Removed commented lines
Replaced - with tab characters. Neat und tidy, just like all the other grown up utils.
Added intendention before commands.
Added capitalization and minor corrections
Wording in help text.
Added GNU standard -h and --help flags to display help message.
Merge pull request #73 from Rovanion/master

Help text style fix!
Spelling
Removed and re-added a line
Added more commenting and did spell and grammar checking on existing commenting. Removed unnecessary extra characters.
Corrected grammar and spelling for commands that print to the console and that print using the server's "say" command
Informed the people on the server of impending lag performing certain commands, and warned players that the server software will restart when a whole backup is performed.